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PHP | xml_set_character_data_handler() Function

 3 years ago
source link: https://www.geeksforgeeks.org/php-xml_set_character_data_handler-function/
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xml_set_character_data_handler() Function
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PHP | xml_set_character_data_handler() Function
  • Last Updated : 31 Oct, 2019

The xml_set_character_data_handler() function is an inbuilt function in PHP which is used to set the character data handler function for XML parser.

Syntax:

bool xml_set_character_data_handler( resource $xml_parser, callable $data_handler )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $xml_parser: It is required parameter. It holds the reference of XML parser to set up character data handler.
  • $data_handler: It is required parameter. It is a string which contains the name of function. 
    handler( resource $parser, string $data )

    The handler function must have these two parameters:

    • $xml_parser: It holds the reference of XML parser which is calling to handler.
    • $data: It holds the character data as a string.

Return Value: This function returns True on success or False on failure.

Note:

  • This function is available for PHP 4.0.0 and newer version.
  • These examples may not work on online IDE. So, try to run it on local server or php hosted servers.

gfg.xml file:

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<?xml version="1.0" encoding="utf-8"?>
<user>
<username> user123 </username>
<name> firstname lastname </name>
<phone> +91-9876543210 </phone>
<detail> I am John Doe. Live in Kolkata, India. </detail>
</user>

Program 1:

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<?php
// Create an XML parser
$xml_parser = xml_parser_create();
// Set the character handler function for XML parser
xml_set_character_data_handler($xml_parser, "char_print");
// Opening xml file
$file_pointer = fopen("gfg.xml", "r");
// Reading xml data from file
while($data = fread($file_pointer, 4096)) {
// Parsing XML data
xml_parse($xml_parser, $data, feof($file_pointer)) or
// Display error when parsing error occurs
die (sprintf("XML Error: %s at line %d",
// Error string
xml_error_string(xml_get_error_code($xml_parser)),
// Current line
xml_get_current_line_number($xml_parser)));
}
// Free to xml parser
xml_parser_free($xml_parser);
fclose($file_pointer);
// Character handler function for XML parser
function char_print($xml_parser, $data_to_print) {
echo $data_to_print;
}
?>

Output:

user123 
firstname lastname 
+91-9876543210 
I am John Doe. Live in Kolkata, India.

Program 2:

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<?php
// Create an xml parser
$xml_parser = xml_parser_create();
// Element handler function named "starting_handler"
// enables custom manupulation for output
function starting_handler($xml_parser,
$element_name, $element_attrs) {
switch($element_name) {
case "USER":
echo "<u>USER DATA</u><br>";
break;
case "USERNAME":
echo "Username: ";
break;
case "NAME":
echo "Name: ";
break;
case "PHONE":
echo "Phone no: ";
break;
case "DETAIL":
echo "More about user: ";
}
}
// Element handler function named "ending_handler"
function ending_handler($xml_parser, $element_name) {
echo "<br>";
}
// Character handler function named "char_handler"
function char_handler($xml_parser, $data) {
echo $data;
}
// Setting element handlers
xml_set_element_handler($xml_parser,
"starting_handler", "ending_handler");
// Setting character data handler
xml_set_character_data_handler($xml_parser, "char_handler");
// Opening xml file
$file_pointer = fopen("gfg.xml", "r");
// Reading xml file 
while ($data = fread($file_pointer, 4096)) {
xml_parse($xml_parser, $data, feof($file_pointer)) or
// Display error while xml parsing
die (sprintf("XML Error: %s at line %d",
// Error string
xml_error_string(xml_get_error_code($xml_parser)),
// Error line number
xml_get_current_line_number($xml_parser)));
}
// Free to xml parser
xml_parser_free($xml_parser);
// Closing file stream
fclose($file_pointer);
?>

Output:

USER DATA
Username: user123
Name: firstname lastname
Phone no: +91-9876543210
More about user: I am John Doe. Live in Kolkata, India.

Reference: https://www.php.net/manual/en/function.xml-set-character-data-handler.php


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